JPS56136075A - Telephone number and call time recording system - Google Patents

Telephone number and call time recording system

Info

Publication number
JPS56136075A
JPS56136075A JP3835580A JP3835580A JPS56136075A JP S56136075 A JPS56136075 A JP S56136075A JP 3835580 A JP3835580 A JP 3835580A JP 3835580 A JP3835580 A JP 3835580A JP S56136075 A JPS56136075 A JP S56136075A
Authority
JP
Japan
Prior art keywords
pulse
telephone line
call time
rise
kinds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3835580A
Other languages
Japanese (ja)
Inventor
Ryozo Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3835580A priority Critical patent/JPS56136075A/en
Publication of JPS56136075A publication Critical patent/JPS56136075A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal
    • H04M15/30—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal the meter or calculation of charges not being controlled from an exchange

Abstract

PURPOSE:To prevent evil influences upon a telephone set and telephone line, by obtaining the output pulse of a telephone set from the telephone line without contact. CONSTITUTION:Telephone line 8 is run in troidal coil 1 divided into two. An original waveform induced at troidal coil 1 is amplified by amplifier 2 and its noise is eliminated by low-pass filter 3; and comparator 4 extracts only the integral pulse that corresponds to the rise and fall of a dial pulse and busy pulse by comparing it with a reference value, and the output signal is used as an interruption request signal to send a request for processing to microprocessor 5. The microprocessor analyzes two kinds of rise and fall interruption timing and the kinds of them to count the number of dial pulses and a call time and then stores the results in temporary memory 6. The stored results are edited by a program and printed out on printer 7, so that the processing is completed.
JP3835580A 1980-03-26 1980-03-26 Telephone number and call time recording system Pending JPS56136075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3835580A JPS56136075A (en) 1980-03-26 1980-03-26 Telephone number and call time recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3835580A JPS56136075A (en) 1980-03-26 1980-03-26 Telephone number and call time recording system

Publications (1)

Publication Number Publication Date
JPS56136075A true JPS56136075A (en) 1981-10-23

Family

ID=12522965

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3835580A Pending JPS56136075A (en) 1980-03-26 1980-03-26 Telephone number and call time recording system

Country Status (1)

Country Link
JP (1) JPS56136075A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202658A (en) * 1982-04-30 1983-11-25 Fujitsu Ltd Call duration rate counting system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202658A (en) * 1982-04-30 1983-11-25 Fujitsu Ltd Call duration rate counting system
JPH0223063B2 (en) * 1982-04-30 1990-05-22 Fujitsu Ltd

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